Land vehicles – Wheeled – Articulated vehicle
Patent
1992-03-26
1993-11-02
Mitchell, David M.
Land vehicles
Wheeled
Articulated vehicle
280509, B62D 5312
Patent
active
052577961
ABSTRACT:
A fifth wheel hitch has a single swinging jaw, i.e., pivotal lock element, a unique cam arm, a locking plunger, a release arm, and release handle that all specially function in an interrelated manner to clearly indicate the locked or unlocked condition of the lock element. The release handle has special notches for cooperative interengagement with the top plate, specifically a lock notch and an unlock notch, engageable with a flange of the fifth wheel plate to cause the release handle to be located in specific positions. A cam surface on a finger of the pivotal lock element operates the novel cam arm to shift the release arm, for shifting it out of the unlock notch when the fifth wheel uncouples from the kingpin. The cam arm is held over center when the jaw is open, preventing the jaws from closing until the kingpin enters. When the release handle is pulled to release the locking plunger, the lock notch engages the top plate to retain the pull handle until released from this notch.
REFERENCES:
patent: 2610069 (1952-09-01), Ketel
patent: 2663575 (1953-12-01), Ketel
patent: 3079175 (1963-02-01), Walther
patent: 3888514 (1975-06-01), Klein
patent: 4447070 (1984-05-01), Inoue
patent: 4659101 (1987-04-01), Buckley
Buckley John T.
Hungerink Gerald W.
Thorwall Gregory R.
Holland Hitch Company
Mitchell David M.
Pike Andrew C.
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